sum_lecture05 - upon the medium in which the wave...

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The Physics of The Pendulum & Properties of Waves Drs. Paulson and Scully
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The Pendulum In the case of the pendulum system , the restorative force is gravity . Energy changes between potential and kinetic : T = 1 f = 2 π l g
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A wave is a disturbance or variation which travels through a medium. The wave speed depends on the medium. Particles in the medium do NOT travel with the wave . Waves transfer energy (but not matter) from a place to another and can do work. Properties of Waves
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A transverse wave , such as light or waves on a string, oscillates in a direction perpendicular to the direction the wave is traveling. A longitudinal wave , such as a sound wave or shock wave, oscillates in the same direction as the wave is traveling. Properties of Waves
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We can characterize waves with three properties which are the wavelength , frequency and wave speed . Properties of Waves λ f = c Wavelength λ Frequency f Wave Speed c Energy=E ~ A 2
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The speed of the wave depends
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Unformatted text preview: upon the medium in which the wave propagates. The speed of sound , for example, is faster the denser the medium. The speed of sound in air also depends on the temperature (in Celsius) as: Properties of Waves v = 331 + 0.6 T C m/s Properties of Waves The speed of light (in a vacuum) is 3 x 10 8 m/s. It is slower in other media. The speed of waves on a string depend on the string tension T and mass per unit length . What happens when we combine more than one wave? The principle of superposition says we just add the amplitudes directly to find the resultant wave. Superposition The phase of one of the waves could be different from the other. Phase is the angle within the cycle that one trails or leads the other Superposition y = A sin( t + ) When waves are completely out of phase (that is they differ by 180 or radians), they may completely cancel! Superposition...
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This note was uploaded on 05/23/2011 for the course GSCI 121 taught by Professor Niculescu,m during the Summer '08 term at James Madison University.

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sum_lecture05 - upon the medium in which the wave...

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